JPH0689001A - Copying machine - Google Patents

Abstract

PURPOSE:To obtain a copying machine in which the contamination of an exposing part caused by air sent from a cooling fan is prevented and cooling efficiency is improved by making the air quantity of the cooling fan small when exposure is performed in the 2nd exposing part. CONSTITUTION:Exposure is performed to one side or both sides of a document fed from a recirculating document feeder(RDH) 22 by a master CPU (MCPU) according to an inputted copying mode. In such a case, in the case of detecting that an optical system 10 is at the 2nd exposing part 20, the MCPU lowers the output of a motor driver so as to make the air quantity of the cooling fan 18 small. Namely, when the optical system 10 stops at the 2nd exposing part 20 disposed near the cooling fan 18, the air quantity of the cooling fan 18 is controlled to be small. When the optical system 10 moves to the 2nd exposing part 20 in the case of copying the document set in the document setting part 23 of the RDH 22, a projecting part provided in a mirror pushes a nozzle 17. Therefore, the tip of the nozzle 17 is faced toward the 2nd exposing part 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling control of an optical system in a copying machine equipped with a recirculating document feeder (RDH).

[0002]

2. Description of the Related Art When reading a document conveyed by RDH, the optical system is stopped at any position of the first exposure section and the second exposure section to expose the document, and therefore the temperature of the document surface and the vicinity of the power lamp is high. Rises. For this reason, in the copying machine equipped with the RDH, a power supply lamp and a cooling fan for blowing air are provided in the vicinity of the power supply lamp to cool the document surface and the vicinity of the power supply lamp.

[0003]

However, in the conventional copying machine, the cooling fan is provided on the side of the second exposure unit, and the air is always blown at a constant air volume in a constant direction.

Therefore, the first distance from the cooling fan is long.
If the cooling of the exposure unit is prioritized, there is a problem that the air blowing of the second exposure unit, which is close to the cooling fan, becomes strong, dust from the outside is blown, and the second exposure unit is easily soiled.
Further, if priority is given to preventing the second exposure portion from becoming dirty, there is a problem that the amount of air blown to the first exposure portion is not sufficient and cooling efficiency deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine in which the optimum amount of air is blown in both the first and second exposure units, the exposure unit is prevented from being contaminated due to the blowing of the cooling fan, and the cooling efficiency is high.

[0006]

SUMMARY OF THE INVENTION A copying machine according to the present invention includes a circulation type original having a first exposing section for exposing one side of an original and a second exposing section for exposing the other side of the original. A feeding device, an optical system that reads a document by stopping at any position of the first exposure unit and the second exposure unit, a cooling fan that is provided on the side of the second exposure unit and blows air to the optical system, and the first exposure. And a second exposure unit cooling unit that reduces the air flow of the cooling fan when performing exposure in the second exposure unit. Characterize.

A circulating type document feeding device having a first exposure section for exposing one side of the document and a second exposure section for exposing the other side of the document, a first exposure section and a second exposure section. Optical system which stops at any position of the section to read the original, a cooling fan which is provided on the side of the second exposure section and blows air to the optical system through a nozzle, and a cooling fan when the second exposure section performs exposure. Nozzle pushing-up means that pushes up the nozzle of (1) above is provided.

[0008]

In the copying machine of the present invention, from the cooling fan provided on the second exposure section side, to the first exposure section that exposes one side of the original and the second exposure section that exposes the other side of the original. The air is blown. At this time, when the optical system stops at the first exposure unit, the air volume sent from the cooling fan is small, and when the optical system stops at the second exposure unit, the air volume sent from the cooling fan is made large.

When air is blown to the first and second exposure units via the nozzles, the nozzles are pushed upward when the optical system stops at the second exposure unit.

[0010]

1 is a diagram showing the construction of a copying machine according to an embodiment of the present invention. An optical system 1 is provided on the top of the main body 1 of the copying machine.
0 is provided, and the nozzle 17 is provided on the left side of the optical system 10.
A cooling fan 18 is provided to blow air to the optical system 10 via the. Further, a document table 21 is provided on the upper portion of the copying machine main body 1.
A circulation type document feeder (RDH) 22 is also provided, and an operation panel and a display unit (not shown) are disposed in the vicinity thereof. The RDH 22 has a document setting section 23, a document transport path 24, and drums 25 and 26. Below the drums 25 and 26 on the upper surface of the main body 1, there are provided a first exposure unit 19 that exposes the back surface of the conveyed document and a second exposure unit 20 that exposes the front surface of the document. When copying a document set in the document setting unit 23, the document is conveyed through the document conveying path 24, the document is wound around the drums 25 and 26 and rotated, and the first exposure unit 19 and the second exposure unit 20 are rotated.
Copy the back and front sides with. At this time, the optical system 10 is stopped below the drum as shown.

Below the optical system 10, a drum-shaped photosensitive member 2 is rotatably supported. A charger 3, a developing unit 4, a registration roller 5, a transfer unit 6, a charge eliminator 7 and a cleaner 8 are arranged around the photosensitive member 2 in the order of the copying process. Further, on the right side of the photoconductor 2, there is a sheet feeding section 31 including a sheet feeding tray and a cassette mounting section, on the left side is a conveying section 32 for conveying the sheet after transfer, and a fixing section 33 for heating and pressing the toner image on the sheet. Is provided.

FIG. 2 is a view showing the arrangement of the optical system 10 in the first exposure section 19 and the second exposure section 20 of the copying machine body 1 according to the first embodiment of the present invention. The optical system 10 includes a copy lamp 11 including a halogen lamp, a plurality of mirrors 12 to 15, a zoom lens 16 and the like. The optical system 10 is attached to an optical system drive wire 41 and can be moved left and right by driving a motor 42. Position sensors 43a and 43b are provided at the ends of the first exposure section 19 and the second exposure section 20, respectively. The position sensors 43a and 43b detect the position of the optical system 10 by being shielded from light by a light shielding plate 44 provided on the copy lamp 11.

FIG. 3 is a block diagram showing a main configuration of a control unit in the copying machine 1. The control unit of the copying machine 1 is composed of a master / slave system, and a master CPU
The (MCPU) 51 includes a ROM 52, a RAM 53, a slave CPU (SCPU) 54, and a slave CPU (SC
PU) 55 and the like are connected. The SCPU 54 is R
It is for DH control, and the SCPU 55 is for optical system control. The MCPU 51 sends commands to the SCPUs 54, 55, etc. according to a program written in advance in the ROM 52, receives status from each SCPU, and controls various solenoids, main motors, and the like.
The data input / output at this time is temporarily stored in a predetermined memory area of the RAM 53. SCPU 54 and 55 are MC
Upon receiving the command sent from the PU 51, the connected devices are controlled.

A ROM 56, a motor driver 57, and a rotary encoder 58 are connected to the SCPU 55. A motor 59 for moving the lamp unit is connected to the motor driver 57. SCPU55 is R
It receives a signal from the rotary encoder 58 according to a program written in advance in the OM 56, and outputs a drive control signal to the motor driver 57.

A copy lamp lighting circuit 60 having a copy lamp 11 and a charging unit 61 having a charger 3 are connected to the MCPU 51. MCPU51
The supply and stop of the voltage to the copy lamp 11 are controlled through the copy lamp lighting circuit 60, and the effective voltage level applied to the copy lamp is adjusted and the charging unit 61 that supplies a high voltage to the charger 3 is controlled. To do. A position sensor 43 and a motor driver 62 are connected to the MCPU 51. The detection result of the position sensor 43 is input to the MCPU 51, and the motor driver 62 drives the cooling fan 18 according to the drive data input from the MCPU 51.

FIG. 4 is a flow chart showing a processing procedure of the control unit when copying is performed in the copying machine 1. M
When the document reading mode is input from the operation panel, the CPU 51 reads the document on the platen in the normal mode or RDH.
It is judged whether it is the mode (n1). When the document reading mode is the normal mode, the MCPU 51 waits for the document to be set on the document table 21 (n20), and scans the optical system to copy the document set on the document table 21.

On the other hand, when the document reading mode is the RDH mode, the MCPU 51 waits for the document to be set in the document setting section 23 of the RDH 22 (n2). When the original is set, the operation waits until the copy mode is input from the operation panel and the copy switch is turned on (n3), and the cooling fan 18 is driven (n4). Then, the document transportation of the RDH 22 is started and (n
5) The SCPU 55 is instructed to start moving the optical system 10 to start copying (n6). After this, the MCPU 51
According to the copy mode input in 3, the original is exposed on one side or both sides of the original conveyed from the RDH 22 (n7 to n11). At this time, in n7, the optical system 10
Is detected in the second exposure section, the MCPU 51 reduces the output of the motor driver 62, and the cooling fan 18
(N9). After this, MCPU51
Copies all the originals set in the original setting section 23 of the RDH 22 and ends the RDH mode (n12).

As described above, according to this embodiment, the RDH
When copying the original set on, when the optical system stops at the first exposure unit arranged far from the cooling fan, the air volume of the cooling fan is large, and the second exposure unit arranged near the cooling fan is large. When the optical system is stopped in the section, the air volume of the cooling fan is controlled to be small.

FIGS. 5 and 7 show a first exposure section 19 and a second exposure section 2 of the copying machine body 1 according to the second embodiment of the present invention.
It is a figure which shows the structure of the optical system 10 in 0. Figure 5
The optical system 10 is in a state where it is stopped at the first exposure section 19, and FIG. 7 is a state where the optical system 10 is stopped in the second exposure section 20. The mirror 12 of the optical system 10 is provided with a protrusion 71. In addition, the cooling fan 18 and the nozzle 17 provided on the left side of the optical system 10 are connected to the support portion 7.
It is formed rotatably by two.

FIG. 6 is a diagram showing the construction of the cooling fan 18 and the nozzle 17. The upper end of the cooling fan 18 is loosely inserted in the nozzle 17, and the lower front portion P of the nozzle 17 is normally in contact with the side of the cooling fan 18 so that the tip of the nozzle 17 faces the first exposure portion 19. Has been done.

In such a copying machine, when a document set in the document setting section 23 of the RDH 22 is copied, when the optical system 10 moves to the second exposure section as shown in FIG. The part 71 pushes up the nozzle 17. As a result, the tip of the nozzle 17 faces the second exposure unit 20.

As described above, according to this embodiment, the RDH
When copying an original set on, the nozzle of the cooling fan faces the first exposure part and is arranged near the cooling fan when the optical system stops at the first exposure part arranged far from the cooling fan. When the optical system stops at the exposed second exposure portion, the nozzle of the cooling fan faces the second exposure portion.

[0023]

According to the present invention, in both the first and second embodiments, the optimum amount of air is blown regardless of the distance from the cooling fan, so that the blowing of the cooling fan does not easily cause contamination. Cooling efficiency is also improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a copying machine that is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an optical system that is a first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a control unit.

FIG. 4 is a flowchart showing a processing procedure of a control unit.

FIG. 5 is a diagram showing a configuration of an optical system that is a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a cooling fan and a nozzle.

FIG. 7 is a diagram showing a state in which the optical system is stopped at the second exposure unit.

[Explanation of symbols]

 10-Optical system 17-Nozzle 18-Cooling fan 19-First exposure unit 20-Second exposure unit 22-Circulating type document feeder 71-Protrusion

Claims (2)

[Claims] 1. A circulating type document feeder including a first exposure unit for exposing one side of a document and a second exposure unit for exposing the other side of the document; a first exposure unit; and a second exposure unit. An optical system that stops at any position of the exposure unit to read the document, a cooling fan that is provided on the second exposure unit side and blows air to the optical system,
First exposure section cooling means for increasing the air volume of the cooling fan when performing exposure in the first exposure section, and second exposure section cooling means for reducing the air volume of the cooling fan when performing exposure in the second exposure section are provided. A copying machine characterized by 2. A circulation type document feeder including a first exposure unit for exposing one surface of a document and a second exposure unit for exposing the other surface of the document; a first exposure unit; and a second exposure unit. An optical system for reading a document by stopping at any position of the exposure unit, a cooling fan provided on the side of the second exposure unit for blowing air to the optical system through a nozzle, and a cooling device for performing exposure in the second exposure unit. A copying machine, comprising: a nozzle pushing-up unit that pushes up a nozzle of a fan.